Furnace



(No Model.)

G. P. 'BURKHARDT.

. FURNACE.

No. 284,181. Patented Sept. 4, 1883.

D, E, and F, which I also prefer to construct UNITED STATES P TENT OFFICE- GOTTLIEB F. BURKHARDT, OF BOSTON, MASSACHUSETTS.

FURNACE.

5 State of Massachusetts, have invented a new and useful Improvement in Furnaces, of which the following is a specification, reference being had to the accompanyingdrawings.

My invention relates to a hot-air furnace; and it consists in the combination of a .combustion-chamber with two or more flues having vertical tubes therein, said flues being for the passage of the smoke and gases from'the fire, and said vertical tubes for the passage of set forth. My invention also consists in such scribed, and specifically pointed out in the claims. I

In the drawings, Figure lis an elevation, and Fig. 2 an end view, of a furnace embodying my invention. "Fig. 3 is avertical section taken on line 1 1 in Fig; 2, and Fig. 4 is a horizontal sectionand plan taken on and be low line 2 2 in Fig. 1.

I prefer to construct the outer walls,A A and B B, of brick. A plate, 0, forms the top or cap of the furnace. the outer walls is divided by the vertical walls of brick, though they may be of other material. Thus are formed the combustion-chamdivision-walls E and F also extending from the bottom K of the furnace to the top plate, 0. While I have shown the combustion-chamber and the vertical flues of aboutthe same size, and have shown three of theseflues, yet they may vary in size with referenceto each other, and there may be only two, or may be more, flues. Above the combustion-chamber is a plate, L, which forms the top of said cham ber, and extendedforms the top of the flue H. For each: of the flues H I J there is a plate, L, to form the top thereof, and a plate, M,to form the bottom thereof. Between the plates L and the plate 0 there are spaces, and between the plates M and the bottom of the furnace K there are spaces, as shown. In flue H there are vertical tubes at, extending from plate M to plate L, in flue I tubes 6, and in flue J the air to be heated, in the manner hereinafter further. details of construction as are hereinafter de The space inclosed by ber G and the vertical flues H, I, and J, the

September 4, 1883,

like vertical tubes, 0. These vertical tubes open into thespaces below the plates M and into the spaces above the plates L, as shown.

The furnace is suitably located with reference to a. chimney, N, which may, when convenient," be built with the furnace, so that one wall, B, of the furnace may form part of a wall of thechimney.

At the upper end of the combustion-chamber G and of the flue H is an opening, d, leading from the combustion-chamber to this flue. At the bottom of the flues H and I there is an opening, 0, leading from one to the other of these flues. At the upper end of the flues I and J is an opening, f, leading from one flue to the other. At the lower end of thefiue J there is an opening, g, leading from this flue to the chimney N.

To the space h below the tubes 0 an opening, 1, leads from the space outside of the furnace or from a cold-air conduit. This opening i may be regulated as to size by means of in the wall F, and from the space a below the tubes b to the space 0 below the tubes (1 is an opening or passage, 1), in the wall E. The

space above the. tubes a and that above the combustion-chamber form one hot-air chamber,O.

. The flame, smoke, or gases from the fire on the grate P pass up the combustion-chamber G, through the opening (1, down the flue H, through the opening 6, up the flue I, through the opening f, down the flue J, and through the opening 9 into the chimney N, around and in contact with the outside of the tubes 11, b, and c. The cold air enters the opening i, passes up the tubes 0, through the opening m, down the tubes 12, through the opening p, up the tubes a into the hot-air chamber 0'. From this hot-air chamber lead as many pi'pes Q, for conducting the hot air, as may be required. These hot-air pipes may connect with the hotair chamber at the top or'sides thereof, according as the location of the rooms to be heated may require.

As the result of the arrangement of the flues and tubes in my furnace, all the heat capable of producing any useful effectmay be taken up by the air from the smoke and gases, since thus time is given for such absorption of heat by the air. The air is also most effectually heated by being first acted on by the smoke and gases as they pass from the furnace, and hence while they are at a comparatively low temperature, and thereafter acted on by them while at their highest temperature, when they leave the fire.

Great economy of heat is secured by means of my furnace, while it is simple and may be constructed with a comparatively small cost.

I claim as my invention 1. In a furnace, the combination of these elements, namely: a combustion-chamber, two or more vertical flues for the passage of the smoke and gases, an opening from the comand B B, divided by two or more walls, and having a top plate, 0, and plates L and M, whereby a combustion-chamber is formed, two or more vertical flues for the passage of the smoke and gases, and air-spaces above and below said flues, vertical tubes connecting said air-spaces, substantially as specified.

3. In a furnace, the combination of the combustion-chamber G, vertical flues H, I, and J, vertical tubes a, b, and c, air-spaces above and below said tubes, and hot-air chamber 0, substantially as specified. v

4. The combination of the combustion-chamber G, vertical flues H I J, vertical tubes or b c, openings d e fg in the division-walls, for the passage-of the smoke and gases, openings 2' m p, for the passage of air into the furnace and through the Walls, spaces h is Z n o, for the air, and the hot-air chamber 0, substantially as described.

GOTTLIEB F. BURKHARDT. VVitnessesr J OSEPH SELIG, EDW. DUMMER. 

